Computer Associates International, Regional Office

1. Computer Associates International, Regional Office Herndon, VA Seth R. Takoch AE Senior Thesis Structural Option April 15, 2003

2. Presentation Outline • Background Information • Existing Structural Conditions • Design Criteria • Redesign • Construction Management • Lighting Design • Conclusions and Recommendation • Acknowledgements SETH R. TAKOCH STRUCTURAL OPTION

3. Location • 15min. Off Beltway • 35mins. Outside D.C • Wood Oak Dr. • Baseball Field

4. Background Information • Function: Computer Associates Int. Regional Headquarters • Size: 233,000 sq. ft. – 6 floors • Rentable Office Space: 207,000 sq. ft. • Architectural Features: • Precast Concrete Façade with Glass Curtain Wall • Six Story Glass Enclosed Atrium • Adjacent Day Care Facility

5. Project Team • Owner – Computer Associates International • Arcitect – Davis, Carter, Scott • Structural Engineer – Smislova, Kehnemui, & Associates. • General Contractor – Clark Construction • Developer – Tishman Speyer Properties • Mechanical – GHT Limited • Plumbing – GHT Limited

6. Existing Structure • Flat Slab Construction • Concrete Structure • 30’ x 30’ Bays • 9” Thick Slab Thickness • 10’ x 10’ x 5-1/2” Drop Panels • 24” x 24” Conc. Columns

7. Existing Structure • Wind Loads are Transferred by Diaphragm Action of Façade • Transferred to Framing by Tributary Area • 8 Frames N-S and 9 Frames E-W • Concrete Frames Resist Lateral Forces • Short and Long Frames • Floor Slab Adds Resistance due to Diaphragm Action

8. Design Limitations • Old Code – BOCA 96 • New Code – IBC 2000 • Local Zoning Ordinances • Similar Square Footage • Minimal Architectural Changes • Floor-to-Floor Heights

9. Proposal • To Redesign a Feasible and Desirable Alternative Structural System and to Incorporate Construction Costs and Schedule Length Into My Solution Time = Money … Money = Time $$$$

10. Possible Faming Alternatives • Composite Steel Construction • Non-Composite Steel Construction

11. Steel Construction • Code – IBC2000 • LRFD Analysis • Parameters • 30’ x30’ Typical Bays • Fy = 50ksi ASTM A992 Steel • F’c = 3ksi • Normal Weight Concrete • Shear Studs - 3-1/2”high, ¾” diameter (composite) • 22 gage Metal Deck

12. Composite Steel Construction • Gravity Analysis – RAM • Determined Beam Sizes • Determined Column Sizes • 2 Story Column Lengths 26’ – 28’ Tall • Ranging from W10’s to W12’s • Beam Sizes W12x14 Spaced at 6’ o.c. • Girders as Deep as a W21’s

13. Non-Composite Construction • Gravity Analysis – RAM • Determined Beam Sizes • Determined Column Sizes • 2 Story Column Lengths 26’ – 28’ Tall • Using W12’s • Beam Sizes W12x14 Spaced at 6’ o.c. • Girders as Deep as a W24’s

14. Depth Comparison • Composite Steel • Average – W12’s • Critical Depth – W21 Composite Saves 20 Tons of Steel • Non-Composite Steel • Average – W12’s • Critical Depth – W24 • Advantage – Composite Steel Construction

15. Lateral System • Shear Wall to Resist Lateral Loading • Based on Critical Wind Loading and Torsion • 2 – 60’ Long Shear Walls • Reinforced to Resist Forces • Deflection of h/400

16. Design • Reinforcement Based on the Following • Vn =  (2f’c bd + Avfyvd/s) • Mn = Asfy (d-a/2)

17. Construction Management ` • Address Two Main Issues • Cost Comparison • Project Duration

18. Construction Management ` • Total Building Cost • D4 Cost • Total = $27,678,667 • 20-25% Accurate • Range of $34.6 million to $20.8 million • Not Very Accurate • $115.33 / sq. ft.

19. Construction Management ` • Total Building Cost • Means Building Construction Cost Data • Separate Estimates for Steel and Concrete • 10 -15% Accurate • More Precise Than D4 • Steel Framing = $96.74 / sq.ft. • Concrete Frame = $98.45 / sq.ft. • Difference = $1.71 / sq.ft. = $410,400

20. Construction Management ` • Cost Comparison • D4 Cost = $115.33/sq.ft. = $27,678,667 • Means Steel = $96.74/sq.ft. = $23,217,600 • Means Concrete = $98.45/sq.ft. = $23,628,000 • Percentage Savings Using Steel = 1.7% Savings

21. Construction Management ` • Scheduling • Means Data to Calculate Duration • Primavera Utilized to Schedule Sequences • Total Duration Steel Erection = 376days • Total Duration Concrete Placement = 847 days

22. Construction Management ` After Scheduling Concrete – 260 Days

23. Construction Management ` After Scheduling – 150 Days

24. Construction Management ` • Savings • Advantage Composite Steel Construction • Time • Advantage Composite Steel Construction • Composite Design is Considered One of the Most Economical Methods of Floor Construction for an Office Building

25. Construction Management ` • Crane Sizing • On Site 3-1/2 Months • Tower Crane • Placed Through Atrium • Liebherr 200HC • Hook Radius – 197ft. • Capacity – 5,070# • Satisfies Critical Lift of 3,000# @160ft.

26. Lighting Design • Design of Lighting of Daycare Facility • Minimum Footcandles of 30fc • Fluorescent Luminaries • 120’ x 56’ Space to Illuminate • 2’ x 4’ Fixtures with 3” Louvers Spaced on a 16’ x 8’ grid • Specification From Lithonia • Workplane of 2-1/2 ft.

27. Lighting Design • Designed Using Luxicon • Renderings on April 15, 2003 • At 9:00 am with Daylighting • At 1:30 pm with Daylighting • At 5:00 pm with Daylighting • Without Daylighting

28. Lighting Design • 9:00 am

29. Lighting Design • At 1:30 pm

30. Lighting Design • At 5:00 pm

31. Lighting Design • Without Daylighting

32. Lighting Design • The Lighting Design Meets Required Parameters of 30fc

33. Conclusion • In Conclusion, Composite Steel Construction is a Better Alternative to Non-Composite Construction. • Composite Steel is a Viable Alternative to a Two-Way Flat Slab System

34. Shout Outs’ My Family My Friends The AE Student Body The Entire AE Faculity Smislova, Kehnemui, & Associates, P.A. Computer Associates The ‘U’ And All Of Those Out There That Stuck With Me

35. Questions ?